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definition of the word arcus

by the Wiktionnary

Shelf cloud, a type of arcus

From Latin arcus

Singular
arcus

Plural
arcus

arcus (plural arcus)

  1. (medicine) A white band of cholesterol that forms at the edge of the cornea
  2. (meteorology) A low, horizontal cloud typically forming at the leading edge of thunderstorm outflow
  3. (entomology) An elastic band around the base of the arolium, a pad at the end of the leg of certain insects
  4. (palynology, plural sometimes arci) An arc-shaped band of thickened sexine extending between two apertures on a pollen grain or spore


<PIE *arkw-, "bow, arrow". The English word arrow is a cognate.

Wikipedia has an article on:
Arcus

Wikipedia

arcus (genitive arcūs); m, fourth declension

  1. arc
  2. bow (arc-shaped weapon used for archery)
  3. rainbow

Fourth declension (4).

Number Singular Plural
nominative arcus arcūs
genitive arcūs arcuum
dative arcuī arcibus
accusative arcum arcūs
ablative arcū arcibus
vocative arcus arcūs

Retrieved from "http://en.wiktionary.org/wiki/arcus"
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